Sheet-metal construction.



WL, LACHMAN Patented N0vzo, 1917.

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trarne reiterar MAURICE LACHIVIAN, OF NEW YORK, N. Y., ASSGNOR T0 UNIVERSAL ELECTRIC WELDING COMPANY, 0F NEW YORK, N.' Y., A CORPORATION OF NEW YORK.

SIHEET-METAL CONSTRUCTION.

nearest.

Original application tiled May 6, 1913,

T0 all 'whom it may concern:

Be it known that l, MAURICE LACHMAN, a citizen oi' the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Sheet- Metal Constructions, of which the 'following is a specification. l

My present invention relates to sheet metal construction and particularly to the manner of joining overlapping surfaces of the metal to unite them together.

The invention is particularly applicablev to the construction of paneled structures and is or' vast importance in the construction of sheet metal doors and it is to the latter specific use that the invention will be described in detail as being applied to, it being understood however' that the invention is not limited thereto.

The main object or' the invention is to utilize the electric welding process for joining the sections of the construction to each other and at the `same time to avoid the objections to the use o this process which have heretofore come up as a result of its attempted use in this connection. To accomplish this l provide a novel construction or relation of the parts to one another at or near the place of joining.

Heretofore while electric welding has been proposed and used to some extent in welding the parts oi' sheet metal panel work,

.it has never been successful to any marked degree owing to the buckling of the metal when the popular methodoil spot welding is employed, due to the localized heating of the parts and the localized pressure applied thereto. Also as the welding is necessarily done near the edge of atleast one of the parts to be joined this has heretofore been attended with a roughening or barring of such edge. j

The invention consists' in the novel construction of sheet metal joint hereinafter more particularly described and then specif fied in the claims.

1n the accompanying drawings, Figure 1 is a front elevation of a sheet metal door embodying this invention.

Fig. Q is an enlarged cross-section of one stile member ofthe door shown in Fig. 1.

Fig. 3 is a perspective View of one corner of the construction.

patented liov. 2d., ililll'i.

Serial No. 765,780. Divided and this application filed October $34,.

Serial No. 797,084.

Fig. 4 is a cross-section through a stile member. illustrating a modification in the location of the joint. j

l indicates the panel of a door preferably made up of two metal plates or sheets spaced apart any desired distance by'blocks 2 secured in any desired manner to the panel plates l. The space within the panel may, if desired, be filled with sound-deadening material as well known in the art.

3 and l indicate the side frame or stile sections of the door while 5 and 6 indicate the top and bottom frame cr stile sections respectively. Between the inner edges of the stile sections 3, l, 5 and 6 and the surface of the panel 1 is formed or secured molding members 7 of any desired surface conformation or ornamentation. The molding 'members may form part oit or be se cured to either the stile sections or the panel member as will hereinafter appear. the stile or frame sections are secured to the panel member as will be presently described, they may be joined lto each other along the meeting edges 8 by brazing, soldering or any 0il the .other methods now well known in the art.

4As illustrated in Figs. l to 3 inclusive, the molding member 7 is integral with the panel plate l and by means of suitable dies stamped into the desired orm. ln this form, the molding member has an outwardly extending Bange 9 which projects for. a greater' or less extent into the space within the stile sections and contacts with the inner surface of the side thereof, the flange 9 beingl offset from the molding whereby a shoulder l0 is formed at the inner edgey of the stile section. The. inner edge of the stile sections is turned over the shoulder l0 as at 11 and preferably contacts with the vertical Wallof said shoulder, the free edge preferably engaging or seating on the surface of the molding 7 to form a close joint and prevent any raw edge of the metal being visible.

rl`he iiange 9 is welded to the inner surface of the face of the stile member preferably by a number of spot Welds 13 disposed preferably near the longitudinal edge of 'the stile member. .l-rs will be readily understood by those skilled in the electric metal work ing art, the parts may be assembled between After iii) lti

suitable current carrying 'electrodes la, 3.5i y

' material located between them.

. funion 13. The process is (Fig. 2) and a current of electricity passed from one electrode to the other through the After the metal has' softened due to theheating effe'ct of lthe current,- pressure is applied by means of the electrodes and the sheets are Welded together. In the case of spot Weld ing; this process is repeated any desired any desired place points of Welded repeated for the opposite side of the door, the electrode l5 being inserted from the end of the stile section and after the Welding is finished this end may be closed lay-soldering or bracing a plate therein as is well known in this art.

Should the inner edge ofthe stile members terminate on a line with the surface Welded `for instance at 16, the Welding operation Would cause a buckling of-the stile member and the edge 16 would become rough and have a serrated eppearance.` By turning over the edge to form'the flange 11 number of times and in to form any number of all buckling.;- and warping, as Well a's any,

serrated ledge is avoided. j

As indicated .in Fig. t the welding or joining of the sections may take place at 'the panel. member rather than on the stile section as indicated in the previous figures Laet/,eed

In this case the molding 7 is preferably iiitegral with the stile section and is .provided with an inwardly projecting flange 17 which seats on a flange 18 offset from the panel 1 by a shoulder 19. The Welding, as above described, takes place between the flanges 17 and 18 While the turned-over edge prevents buckling as above described.

The corners of the moldings Z maybe mated or joined together in any suitable manner as will be readily understood by those skilled in the art.

This application is a division of my prior application for patent forV .metal panel Work, filed May 6th 1913, Serial No. 765,780.

What I claim as my invention is In a metallic construction, the combina tion of two members in surface contact and Welded together at spots along such contacting surfaces, a shoulder on one member adjacent the Welded areas anda free edge of the other member turned over said shoulder.

Signed at New York in the county of New York and State of New York this 22nd day, of October A. D. 1918.

MAURICE LACHMAN.

Witnesses:

F. B. TowNsENn, HENRY A. GENS.- 

